Just replacing the 9 pin mini DIN cable with a standard 9 pin DSUB cable and the usual pinout and it would work well.
They have the traditional XA/XB, YA/YB pairs, +5v and GND, and button 1/2/3 for nine wires.
If desired, we could make the socket on the Issue 8 and SSQB a 9 pin mini DIN in MS BUS mouse pinout, for 100% compatibility with ordinary bus mice?
I can also obtain standard bus mice VERY economically.
Here's the pin out if anyone wants to experiment:
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Pin 1 SW2 Mouse button 2 Pin 2 SW3 Mouse button 3 Pin 3 GND Ground Pin 4 XB X position Pin 5 YA Y position Pin 6 YB Y position Pin 7 SW1 Mouse button 1 Pin 8 Vcc +5 V Power Pin 9 XA X position XA/XB and YA/YB indicate movement and direction based on quadrature phase.